Estimation of the Absolute Density of Glass Following the Sink/Float Technique

Adult mosquitoes and other nematocerous flies (body length >2mm) were trapped in pastures using a sweep net and a motorized backpack aspirator. Absolute density was determined using a 0.1 m2 area sampler. Captures from each method at each absolute density were compared via linear regression techniques. Empirical equations were developed to estimate the absolute mosquito density. Sweep nets displayed higher R2 values and lower coefficients of variation than the aspirator.

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The influence of the ionizer geometry on the absolute density calibration of reactive neutral species in a molecular beam mass spectrometry

Review of Scientific Instruments ◽

10.1063/1.3703305 ◽

2012 ◽

Vol 83 (4) ◽

pp. 045114 ◽

Cited By ~ 5

Author(s):

Tobias Krähling ◽

Dirk Ellerweg ◽

Jan Benedikt

Keyword(s):

Mass Spectrometry ◽

Molecular Beam ◽

Neutral Species ◽

Molecular Beam Mass Spectrometry ◽

Absolute Density ◽

The Absolute

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XLII. On a method of determining the absolute density of a gas

The London Edinburgh and Dublin Philosophical Magazine and Journal of Science ◽

10.1080/14786449008620039 ◽

1890 ◽

Vol 30 (186) ◽

pp. 379-386

Author(s):

J. Joly

Keyword(s):

Absolute Density ◽

The Absolute

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III. On the specific heats of gases at constant volume. Part I. Air, carbon dioxide, and hydrogen

Proceedings of the Royal Society of London ◽

10.1098/rspl.1890.0049 ◽

1891 ◽

Vol 48 (292-295) ◽

pp. 440-441 ◽

Cited By ~ 2

Keyword(s):

Carbon Dioxide ◽

Specific Heat ◽

Mean Value ◽

Constant Volume ◽

Specific Heats ◽

Absolute Density ◽

The Mean ◽

The Absolute

In this first notice the specific heats, at constant volumes, of air, carbon dioxide, and hydrogen are treated over pressures ranging from 7 to 25 atmospheres. The range of temperature is not sensibly varied. It is found that the specific heats of these gases are not constant, but are variable with the density. In the case of air the departure from constancy is small and positive; that is, the specific heat increases with increase of the density. The experiments afford directly the mean value 0·1721 for the specific heat of air at the absolute density of 0·0205, corresponding to the pressure of 19·51 atmospheres. A formula based on the variation of the specific heat with density observed in the experiments ascribes the value 0·1715 for the specific heat at the pressure of one atmosphere.

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